Track Matte Key Effect for VSE
You need to work &quot;effects&quot; in the compositor.
It seems you need to track and key at the same time.
If this is the case, you will first need to address the track (movie clip editor), once you generate your 8 obligatory tracking points, you can attach whatever you need, then use the 3D space to &quot;stick&quot; your motion graphics plane (or .mov), and finally go to the compositor window and now work the part of the keying.

Ian Hubert shows different techniques that might be helpful to your workflow here:
https://youtu.be/RxD6H3ri8RI
If you need further assistance with your question, please let us know. Thanks!